/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.confignode.procedure.impl.sync;

import org.apache.commons.lang3.StringUtils;
import org.apache.iotdb.common.rpc.thrift.TSStatus;
import org.apache.iotdb.commons.exception.sync.PipeException;
import org.apache.iotdb.commons.exception.sync.PipeSinkException;
import org.apache.iotdb.commons.sync.pipe.PipeInfo;
import org.apache.iotdb.commons.sync.pipe.PipeStatus;
import org.apache.iotdb.commons.sync.pipe.SyncOperation;
import org.apache.iotdb.commons.utils.TestOnly;
import org.apache.iotdb.confignode.procedure.env.ConfigNodeProcedureEnv;
import org.apache.iotdb.confignode.procedure.exception.ProcedureException;
import org.apache.iotdb.confignode.procedure.state.sync.OperatePipeState;
import org.apache.iotdb.confignode.procedure.store.ProcedureType;
import org.apache.iotdb.confignode.rpc.thrift.TCreatePipeReq;
import org.apache.iotdb.db.utils.sync.SyncPipeUtil;
import org.apache.iotdb.rpc.RpcUtils;
import org.apache.iotdb.rpc.TSStatusCode;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.*;

public class CreatePipeProcedure extends AbstractOperatePipeProcedure {
    private static final Logger LOGGER = LoggerFactory.getLogger(CreatePipeProcedure.class);

    private PipeInfo pipeInfo;
    private Set<Integer> executedDataNodeIds = new HashSet<>();

    public CreatePipeProcedure() {
        super();
    }

    public CreatePipeProcedure(TCreatePipeReq req) throws PipeException {
        super();
        this.pipeInfo = SyncPipeUtil.parseTCreatePipeReqAsPipeInfo(req, System.currentTimeMillis());
    }

    @TestOnly
    public void setExecutedDataNodeIds(Set<Integer> executedDataNodeIds) {
        this.executedDataNodeIds = executedDataNodeIds;
    }

    @Override
    boolean executeCheckCanSkip(ConfigNodeProcedureEnv env) throws PipeException, PipeSinkException {
        LOGGER.info("Start to create PIPE [{}]", pipeInfo.getPipeName());
        env.getConfigManager().getSyncManager().checkAddPipe(pipeInfo);
        return false;
    }

    @Override
    void executePreOperatePipeOnConfigNode(ConfigNodeProcedureEnv env) throws PipeException {
        LOGGER.info("Start to pre-create PIPE [{}] on Config Nodes", pipeInfo.getPipeName());
        TSStatus status = env.getConfigManager().getSyncManager().preCreatePipe(pipeInfo);
        if (status.getCode() != TSStatusCode.SUCCESS_STATUS.getStatusCode()) {
            throw new PipeException(status.getMessage());
        }
    }

    @Override
    void executeOperatePipeOnDataNode(ConfigNodeProcedureEnv env) throws PipeException {
        LOGGER.info("Start to broadcast create PIPE [{}] on Data Nodes", pipeInfo.getPipeName());
        Map<Integer, TSStatus> responseMap =
                env.getConfigManager().getSyncManager().preCreatePipeOnDataNodes(pipeInfo);
        TSStatus status = RpcUtils.squashResponseStatusList(new ArrayList<>(responseMap.values()));
        executedDataNodeIds.addAll(responseMap.keySet());
        if (status.getCode() != TSStatusCode.SUCCESS_STATUS.getStatusCode()) {
            throw new PipeException(
                    String.format(
                            "Fail to create PIPE [%s] because %s.",
                            pipeInfo.getPipeName(),
                            StringUtils.join(
                                    responseMap.values().stream()
                                            .filter(i -> i.getCode() != TSStatusCode.SUCCESS_STATUS.getStatusCode())
                                            .map(TSStatus::getMessage)
                                            .toArray(),
                                    ", ")));
        }
    }

    @Override
    void executeOperatePipeOnConfigNode(ConfigNodeProcedureEnv env) throws PipeException {
        LOGGER.info("Start to create PIPE [{}] on Config Nodes", pipeInfo.getPipeName());
        TSStatus status =
                env.getConfigManager()
                        .getSyncManager()
                        .setPipeStatus(pipeInfo.getPipeName(), PipeStatus.STOP);
        if (status.getCode() != TSStatusCode.SUCCESS_STATUS.getStatusCode()) {
            throw new PipeException(status.getMessage());
        }
    }

    @Override
    SyncOperation getOperation() {
        return SyncOperation.CREATE_PIPE;
    }

    @Override
    protected boolean isRollbackSupported(OperatePipeState state) {
        switch (state) {
            case OPERATE_CHECK:
            case PRE_OPERATE_PIPE_CONFIGNODE:
            case OPERATE_PIPE_DATANODE:
                return true;
        }
        return false;
    }

    @Override
    protected void rollbackState(ConfigNodeProcedureEnv env, OperatePipeState state)
            throws IOException, InterruptedException, ProcedureException {
        LOGGER.info("Roll back CreatePipeProcedure at STATE [{}]", state);
        switch (state) {
            case OPERATE_CHECK:
                env.getConfigManager().getSyncManager().unlockSyncMetadata();
                break;
            case PRE_OPERATE_PIPE_CONFIGNODE:
                TSStatus status = env.getConfigManager().getSyncManager().dropPipe(pipeInfo.getPipeName());
                if (status.getCode() != TSStatusCode.SUCCESS_STATUS.getStatusCode()) {
                    throw new ProcedureException(
                            String.format(
                                    "Failed to create pipe and failed to roll back because %s. Please execute [DROP PIPE %s] manually.",
                                    status.getMessage(), pipeInfo.getPipeName()));
                }
                break;
            case OPERATE_PIPE_DATANODE:
                env.getConfigManager()
                        .getSyncManager()
                        .operatePipeOnDataNodesForRollback(
                                pipeInfo.getPipeName(),
                                pipeInfo.getCreateTime(),
                                SyncOperation.DROP_PIPE,
                                executedDataNodeIds);
                break;
            default:
                LOGGER.error("Unsupported roll back STATE [{}]", state);
        }
    }

    @Override
    public void serialize(DataOutputStream stream) throws IOException {
        stream.writeShort(ProcedureType.CREATE_PIPE_PROCEDURE.getTypeCode());
        super.serialize(stream);
        pipeInfo.serialize(stream);
        ReadWriteIOUtils.writeIntegerSet(executedDataNodeIds, stream);
    }

    @Override
    public void deserialize(ByteBuffer byteBuffer) {
        super.deserialize(byteBuffer);
        pipeInfo = PipeInfo.deserializePipeInfo(byteBuffer);
        executedDataNodeIds = ReadWriteIOUtils.readIntegerSet(byteBuffer);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        CreatePipeProcedure that = (CreatePipeProcedure) o;
        return Objects.equals(pipeInfo, that.pipeInfo)
                && Objects.equals(executedDataNodeIds, that.executedDataNodeIds);
    }

    @Override
    public int hashCode() {
        return Objects.hash(pipeInfo, executedDataNodeIds);
    }
}
